<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="back"
    ></van-nav-bar>
    <!-- /导航栏 -->
    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label"
           class="publish-date">{{ article.pubdate | relativeTime }}</div>

            <follow-user
              :is_followed="article.is_followed"
              :user_id="article.aut_id"
              @update-follow="article.is_followed = $event"
               />

        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body"
         v-html="article.content"
         ref="article-content"
         ></div>
        <van-divider>正文结束</van-divider>
              <!-- 文章评论列表 -->
          <comment-list
          :source="article.art_id"
          :list="commentList"
          @onload-success="totalCommentCount = $event"
          @click-reply="onReplyClick"
           />
        <!-- /文章评论列表 -->
         <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isPostShow = true"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        class="comment-icon"
        :info="totalCommentCount"
      />
      <!-- 收藏 -->
      <collect-article
       class="btn-item"
       v-model="article.is_collected"
       :article-id="article.art_id"
       />

      <like-article class="btn-item"
      v-model="article.attitude"
      :article-id="article.art_id"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>

     <van-popup
          v-model="isPostShow"
          position="bottom"
        >
          <comment-post
           :target="article.art_id"
           @post-success="onPostSuccess"
           />
        </van-popup>
    <!-- /底部区域 -->
      </div>
      <!-- /加载完成-文章详情 -->
      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div  v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button
         class="retry-btn"
          @click="loadArtcileInfo"
          >点击重试</van-button>
      </div>

      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

 <!-- 评论回复 -->
<van-popup
  v-model="isReplyShow"
  position="bottom"
  style="height: 100%"
>
  <comment-reply
  v-if="isReplyShow"
  :comment="currentComment"
  @close="isReplyShow = false"
  />
</van-popup>
<!-- /评论回复 -->

  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user.vue'
import collectArticle from '@/components/collect-article'
import LikeArticle from '@/components/like-article'
import CommentList from './components/comment-list'
import CommentPost from './components/comment-post'
import CommentReply from './components/comment-reply'
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    collectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentReply
  },
  provide: function () {
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data () {
    return {
      article: {},
      loading: true,
      errStatus: 0,
      isFollowLoading: false,
      totalCommentCount: 0,
      isPostShow: false,
      commentList: [],
      isReplyShow: false,
      currentComment: {}
    }
  },
  computed: {},
  watch: {},
  created () {
    this.loadArtcileInfo()
  },
  mounted () {},
  methods: {
    back () {
      console.log(123)
      this.$router.back()
    },
    previewImg () {
      const contentEl = this.$refs['article-content']
      const allImg = contentEl.querySelectorAll('img')
      const images = []
      allImg.forEach((img, index) => {
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            images,
            // 预览图片的起始位置
            startPosition: index
          })
        }
      })
    },
    async loadArtcileInfo () {
      try {
        this.loading = true
        const { data } = await getArticleById(this.articleId)
        this.article = data.data
        setTimeout(() => {
          this.previewImg()
        }, 10)
      } catch (err) {
        if (err.response && err.response.status === 400) {
          this.errStatus = 404
        }
        this.$toast('获取数据失败')
      }
      this.loading = false
    },
    onPostSuccess (data) {
      this.isPostShow = false
      this.commentList.unshift(data.new_obj)
    },
    onReplyClick (comment) {
      this.currentComment = comment
      this.isReplyShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  /deep/  .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
